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Don't buy anything before you shop the bay and craiglook.com (don't put in a zip code) for another flash. Often a used flash is reasonably close to the price of a new part. Your flash may be worth the repair, I am not looking at it so I can't say.
If you want to get a part, and if the flash is a few years old, there will be broken models for sale everywhere. And Photo.net has a forum for everything related to cameras. I often get parts sent to me free even though I am willing to pay for them. Someone will have the part you need.
Other than that you can call the maker and ask if they will send you a part free. I am amazed by how many companies are willing to send free parts on things that should not have broken. It never hurts to ask.
if it is a Japanese 283, CAREFUL, you are working with ~300V
remove the sensor from the front. Short out the terminals at 7 o'clock and 11 o'clock with eg a paper clip, and then charge up the flash . Short the centre terminal with the one at 7 o'clock. If the flash fires, then it probably needs a replacement hot shoe from ebay. If it doesn't, it is a simple job to fix for an electronics worker. Manuals are available on ebay.
I repeat, careful with the Japanese flashes, you will have ~300 volts near you fingers, so if you are less than 100% confident that you won't blow the top of a finger (or worse), get an electronics worker to look at it.
Don't use the ebay hot shoes on a 300 volt flash, you will have the 300 volts out in the open and ready to bite you - have a look how well hidden the second contact is on the Vivitar plastic hot shoe.
the Feral Photographer
The Vivitar 283 was manufactured in China & Japan over a number of years & the specifications did change over this period.
The older Vivitar flashes had a voltage on the shoe which could reach 150 volts whilst the later ones had voltages of only 5 to 9 volts.
If you have, or can get hold of, a small voltmeter then you can measure this voltage.
Turn on your flash & let the unit charge up to 'ready' & connect the meter between the contact in the centre of the shoe & the little contact tucked away in the lip of the shoe. (DC volts not AC) There is no danger to you in doing this!
This should tell the voltage on the shoe of your unit & if it is 15 volts or less, it will be fine with your digital Nikon camera. If more than 15 volts than best not to use it.